pull out code out of KotlinCompiler and into a testable CompileEnvironment; smoke test for CompileEnvironment

compiler/testData/compiler/smoke/Smoke.kt

@@ -0,0 +1,4 @@
+namespace Smoke
+
+fun main(args: Array<String>) {
+}

compiler/testData/compiler/smoke/Smoke.kts

@@ -0,0 +1,8 @@
+import kotlin.modules.ModuleSetBuilder
+
+fun ModuleSetBuilder.defineModules() {
+    module("smoke") {
+        source files "Smoke.kt"
+        jar name System.getProperty("java.io.tmpdir") + "/smoke.jar"
+    }
+}